Thank you for the reply.
I just realized I should have mentioned before that I want my initial startup movie to play entirely unless players want to skip it.
However, for a test I applied the settings from your screenshot and now the 16,3 seconds long startup movie shows for a split second only and instantly skips.
Because I don’t want it to be like that I set “skip when done loading” to false and only left the -1 for the length in as I had set this to the length of the startup movie and now everything behaves as it should 
ONE more question though:
I see that “Loading text” can be localized but which directory would I need to include for the loc dashboard to be able to gather that text? I include only certain directories to avoid gathering all kinds of texts that don’t need any localization at all aka don’t have anything to do with my game.
Thank you!
// EDIT: I found out how to localize the loading screen text. So if anyone else is wondering and doesn’t know how to, I’d like to share:
First go into your project settings and into Async Loading screen on the left, then search for or scroll down to where it says “Loadingtext”.
Then click the flag icon and make sure you copy out what’s in “Namespace” and in “Key”
You also want to hover over the actual loading text to get the “Source”, like so:
With all those 3 things jotted down, go to anywhere in your project where your localization dashboard picks up localization texts to gather from and create a new “String Table”. I named mine “ST_AsyncLoadingScreenTxt” and put it into my UI folder, like so:
In the next step open up that string table and paste all the values jotted down before into the following fields and click “Add”, like so:
From here on just save that string table, and go into your project settings → Async Loading screen again → search for that Loading Text entry as before, click the flag again.
Click on the dropdown of “String Table”, choose your string table there like so:
Close project settings, go into your localization dashboard, hit “Gather Texts” as usual and find your new entry for the Loading Screen Text there. Don’t forget to Compile Texts after localizing and you’re good to go